/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package crfsvm.crf.een_phuong;

import java.io.File;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.swing.*;
import javax.swing.filechooser.*;

/**
 *
 * @author Thien
 */
public class ExampleFileFilter extends FileFilter
{
    private static String TYPE_UNKNOWN = "Type Unknown";
	private static String HIDDEN_FILE = "Hidden File";

	private Hashtable filters = null;
	private String description = null;
	private String fullDescription = null;
	private boolean useExtensionsInDescription = true;

	public ExampleFileFilter()
	{
		this.filters = new Hashtable();
	}

	public ExampleFileFilter(String extension)
	{
		this(extension,null);
	}

	public ExampleFileFilter(String extension, String description)
	{
		this();
		if(extension!=null)
			addExtension(extension);
		if(description!=null)
			setDescription(description);
	}

	public ExampleFileFilter(String[] filters)
	{
		this(filters, null);
	}

	public ExampleFileFilter(String[] filters, String description)
	{
		this();
		for (int i = 0; i < filters.length; i++)
		{
			addExtension(filters[i]);
		}
		if(description!=null)
			setDescription(description);
	}

	public boolean accept(File f)
	{
		if(f != null)
		{
			if(f.isDirectory())
			{
				return true;
			}
			String extension = getExtension(f);
			if(extension != null && filters.get(getExtension(f)) != null)
			{
				return true;
			};
		}
		return false;
	}

	public String getExtension(File f)
	{
		if(f != null)
		{
			String filename = f.getName();
			int i = filename.lastIndexOf('.');
			if(i>0 && i<filename.length()-1)
			{
				return filename.substring(i+1).toLowerCase();
			};
		}
		return null;
	}

	public void addExtension(String extension)
	{
		if(filters == null)
		{
			filters = new Hashtable(5);
		}
		filters.put(extension.toLowerCase(), this);
		fullDescription = null;
	}

	public String getDescription()
	{
		if(fullDescription == null)
		{
			if(description == null || isExtensionListInDescription())
			{
				fullDescription = description==null ? "(" : description + " (";
				Enumeration extensions = filters.keys();
				if(extensions != null)
				{
					fullDescription += "." + (String) extensions.nextElement();
					while (extensions.hasMoreElements())
					{
						fullDescription += ", ." + (String) extensions.nextElement();
					}
				}
				fullDescription += ")";
			}
			else
			{
				fullDescription = description;
			}
		}
		return fullDescription;
	}

	public void setDescription(String description)
	{
		this.description = description;
		fullDescription = null;
	}

	public void setExtensionListInDescription(boolean b)
	{
		useExtensionsInDescription = b;
		fullDescription = null;
	}

	public boolean isExtensionListInDescription()
	{
		return useExtensionsInDescription;
	}

}
